There are many maths puzzles that have not been solved. Any puzzle that has an answer cannot be harder than one that mathematicians still have not solved. So a second hardest puzzle cannot exist.
Even amongst puzzles with answers, what you may consider hard may be easy to someone else, and conversely.
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The hardest question is too difficult to conjure.
What is the exact value of pi in figures.
Different people find different problems hard and so it is not possible to answer the question.
Different people find different problems hard and so it is not possible to answer the question.
Different people find different problems hard and so it is not possible to answer the question.